how do I re-install Mac OS on my Mac Pro? I need 10.13.6

Robotiko380 Said:

"I need to re-install Mac OS on my mid 2010 Mac Pro...How do I get it online?"

-------

Reinstall the macOS:

Go Here: How to Reinstall macOS from macOS Recovery - Apple Support. Important: Be certain to create a backup of your Mac prior to all of this. That way, you can have something to restore from the Mac from, should anything go wrong with the reinstall. Once reinstalled, try this once more. If you cannot use Wi-Fi, then try using Ethernet.

If you have a Mac that can run 10.13.6 you can download it using these instructions

How to get old versions of macOS - Apple Support

You can make a bootable USB install median using:

Apple’s instructions

How to create a bootable installer for macOS

What state is your Mac Pro from 2010 in now? What can it do and not do?

Is MacOS working ? what version?

Can you get to Recovery? do you have a Time machine backup?